Whale Duo Control
Technical documentation and troubleshooting for the Whale Duo Control panel, which governs both the Space Heater and Water Heater on vehicles fitted with this combination heating system.
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Whale Duo Control Space Heater lockout: inadequate gas supply | Gas bottle empty, low, or supply pressure isn't the required 30mbar LPG | Check the gas supply and confirm it's delivering 30mbar LPG, then clear the lockout (Step 4). | DIY Safe |
N/A | Whale Duo Control Space Heater lockout: overheat | Air vents or ducts are restricted | Check the air vents and ducts aren't restricted, wait 10 minutes for the heater to cool, then clear the lockout (Step 4). | DIY Safe |
N/A | Whale Duo Control Space Heater lockout: inadequate supply voltage | Voltage outside the 10.5V-15.9V DC operating range (heater is inoperable below 10.1V) | Check and correct the supply voltage, then clear the lockout (Step 4). | DIY Safe |
N/A | Whale Duo Control Space Heater lockout: flue blockage | The flue is blocked | Check the flues for blockages and clear them, then clear the lockout (Step 4). | DIY Safe |
N/A | Whale Duo Control Space Heater lockout: internal fault | An internal fault with the heater | Clear the lockout (Step 4); if the fault remains, contact Whale Support at +44 (0)845 217 2933. | DIY Check / Tech Fallback |
N/A | Whale Duo Control Space Heater lockout: multiple faults | More than one fault condition has occurred at once | Power the heater off, check it for recurring faults, power it back on, then clear the lockout (Step 4). | DIY Safe |
N/A | Whale Duo Control heater lockout persists after following the recommended action | The fault hasn't been resolved by the standard steps | Contact Whale Support at +44 (0)845 217 2933 - customers in Europe should refer to the enclosed Webasto Service Information instead. | Professional Intervention Required |
N/A | Whale Duo Control Water Heater fault: No Flame Detected | No gas in the bottle, a blockage in the gas line, using Butane below +5°C, or a blocked combustion air/exhaust flue | Check the gas supply, use Propane rather than Butane below +5°C, and check the combustion air inlet and exhaust flue for blockages, then clear the lockout. | DIY Safe |
N/A | Whale Duo Control Water Heater fault: Overheat | The Water Heater isn't full of water | Check there's water in the appliance; wait at least 5-10 minutes for the heater to cool before clearing the lockout. | DIY Safe |
N/A | Whale Duo Control Water Heater fault: Low/High Supply Voltage | Supply voltage at the Water Heater is outside the 10V-15V DC operating range | Check the battery voltage; if within range, check the connections between the Water Heater and battery, and check the alternator/external charging, then clear the lockout. | DIY Safe |
N/A | Whale Duo Control Water Heater fault: Air Proving | The combustion air inlet flue or exhaust flue is blocked | Make sure neither the combustion-air inlet flue nor the exhaust flue is blocked, then clear the lockout. | DIY Safe |
N/A | Whale Duo Control Water Heater fault: Other/Internal Fault | An internal fault with the heater | Try clearing the lockout. If it still won't clear, contact Whale Support at +44 (0)845 217 2933. | DIY Check / Tech Fallback |
N/A | Whale Duo Control Water Heater fault: General Fault | Either two faults have happened together, or five or more attempts to clear the lockout have already failed | Turn off power to the Water Heater, check it for recurring faults, and turn power back on, then follow the lockout-clearing procedure. | DIY Safe |
Frequently Asked Questions
Q: How do I clear a Whale Duo Control Water Heater lockout?
Hold down the water heat setting button together with the plus symbol button for 3 seconds to reset the lockout - there's no need to reset anything on the heater itself, it's handled entirely from the control panel. Contact Whale Support at +44 (0)845 217 2933 if problems continue.
Q: Does Whale make a thermostatic mixing valve?
Yes, product code is WX1599.